Thank you brynn, I have no idea where I go the notion that I had to install python seperately. A few years back this is what someone told me, I did that and everything worked.
I looked at the link you gave me, but I do not seem to have a seperate python folder anywhere, in the inkscape folder I only have the folders doc, etc, lib and share.
Anyway, I uninstalled inkscape and python and univconverter.
reinstalled inkscape uniconverter. Then when I tried to save a plt file I go the error message that I have to install uniconverter into inkscapes/lib/python folder.
I did that and got the same message.
I uninstalled uniconverter and installed it into inkscape/lib/python/2to3 and got the same message again.
I have the following folders in inkscape/lib/python
bsddb
compiler
config
ctypes
curses
distutils
email
encodings
ensurepip
hotshot
idlelib
importlib
json
lib2to3
lib-dynload
lib-tk
logging
msilib
multiprocessing
plat-win32
pydoc_data
site-packages
sqlite3
Tools
unittest
wsgiref
xml
Should I uninstall uniconverter and reinstall it into one of these folders ?
Sorry to be a pain, but love inkscape, it has been perfect for me over the last 3 years.